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Thread: Audio Recording / Logging to SD card --> microSoundRecorder

  1. #126
    Senior Member
    Join Date
    Oct 2015
    Vermont, USA
    I just found this thread while looking for how to write WAV rather than just RAW to an SD card. What a great project! (And thanks for using the Tympan BTW.)

    And, Walter, thanks for packaging up your code on GitHub so that I can learn from it.


  2. #127
    Senior Member DD4WH's Avatar
    Join Date
    Oct 2015
    Central Europe
    We now use a total of 12 microSoundRecorders for recording nocturnal Crex crex (corn crake). Thank you again, Walter, for providing us with this Teensy 3.6 recording tool with your software!

    Our hardware setup now consists of a plastic lunch box with:

    * two LiIon batteries of type 18650 with 3.7 Volts and 3.4Ah each
    * two battery protection chips (AliExpress)
    * integrated -USB charge module (AliExpress)
    * Teensy 3.6 using the integrated SD card slot
    * one ICS43434 I2S microphone on a separate tiny PCB (if you do not dare to solder this mic, the ready-to-use PCB can be purchased from onehorse / Pesky products on tindie)

    Click image for larger version. 

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    A zip plastic bag makes the whole thing waterproof. The thin plastic does not alter the sound characteristics or the sound level significantly in our experience.

    We use a PCB originally designed for the PassiveRecorder, an ultrasound recording device for bats. We just leave the ultrasound specific parts (preamp) and the display/joystick etc. unmounted.

    Our hardware setup for the Audio Recorder is the same as shown in the Wiki, but we use an additional RC (470 Ohms, 470F) combination to filter the power supply of the ICS43434 microphone.

    You can imagine that the amount of wav file audio recordings very quickly grows into tens or hundreds of Gigabytes. So it will very quickly be impossible to listen to all the recordings. So we need artificial intelligence!

    I added some open source tools which can automatically classify audio recordings to species using different artifical intelligence algorithms in the microSoundRecorder WIKI.

    Have fun with the microSoundRecorder! All the best,

    Frank DD4WH

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